/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Returns all nodes in all graphs of at least the minimum node type
template<class MinNodeType, class ArrayClassType> static void GetAllNodesOfClassEx ( const [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [TArray](API\Runtime\Core\Containers\TArray)< ArrayClassType * > & OutNodes )